From left, Moderator Brian Sweany, Senior Executive Editor at Texas Monthly, left, and Mayor of San Antonio, Julian Castro, center, listens to former Governor of Mississippi, Haley Barbour, during the 'Pathway to the American Dream: Immigration Policy in the 21st Century' panel at the Civil Rights Summit at the LBJ Presidential Library on the University of Texas campus in Austin, Tx., on Tuesday, April 8, 2014. less

From left, Moderator Brian Sweany, Senior Executive Editor at Texas Monthly, left, and Mayor of San Antonio, Julian Castro, center, listens to former Governor of Mississippi, Haley Barbour, during the 'Pathway ... more

From left, Moderator Brian Sweany, Senior Executive Editor at Texas Monthly, left, and former Governor of Mississippi, Haley Barbour, far right, listen to the Mayor of San Antonio, Julian Castro speak during the 'Pathway to the American Dream: Immigration Policy in the 21st Century' panel at the Civil Rights Summit at the LBJ Presidential Library on the University of Texas campus in Austin, Tx., on Tuesday, April 8, 2014. less

From left, Moderator Brian Sweany, Senior Executive Editor at Texas Monthly, left, and former Governor of Mississippi, Haley Barbour, far right, listen to the Mayor of San Antonio, Julian Castro speak during ... more

From left, Moderator Brian Sweany, Senior Executive Editor at Texas Monthly, left, and Mayor of San Antonio, Julian Castro, center, listens to former Governor of Mississippi, Haley Barbour, during the 'Pathway to the American Dream: Immigration Policy in the 21st Century' panel at the Civil Rights Summit at the LBJ Presidential Library on the University of Texas campus in Austin, Tx., on Tuesday, April 8, 2014. less

From left, Moderator Brian Sweany, Senior Executive Editor at Texas Monthly, left, and Mayor of San Antonio, Julian Castro, center, listens to former Governor of Mississippi, Haley Barbour, during the 'Pathway ... more

From left, Moderator Brian Sweany, Senior Executive Editor at Texas Monthly, left, and Mayor of San Antonio, Julian Castro, center, listens to former Governor of Mississippi, Haley Barbour, during the 'Pathway to the American Dream: Immigration Policy in the 21st Century' panel at the Civil Rights Summit at the LBJ Presidential Library on the University of Texas campus in Austin, Tx., on Tuesday, April 8, 2014. less

From left, Moderator Brian Sweany, Senior Executive Editor at Texas Monthly, left, and Mayor of San Antonio, Julian Castro, center, listens to former Governor of Mississippi, Haley Barbour, during the 'Pathway ... more

From left, Moderator Brian Sweany, Senior Executive Editor at Texas Monthly, left, and Mayor of San Antonio, Julian Castro, center, listens to former Governor of Mississippi, Haley Barbour, during the 'Pathway to the American Dream: Immigration Policy in the 21st Century' panel at the Civil Rights Summit at the LBJ Presidential Library on the University of Texas campus in Austin, Tx., on Tuesday, April 8, 2014. less

From left, Moderator Brian Sweany, Senior Executive Editor at Texas Monthly, left, and Mayor of San Antonio, Julian Castro, center, listens to former Governor of Mississippi, Haley Barbour, during the 'Pathway ... more

Mayor of San Antonio, Julian Castro speaks during the 'Pathway to the American Dream: Immigration Policy in the 21st Century' panel at the Civil Rights Summit at the LBJ Presidential Library on the University of Texas campus in Austin, Tx., on Tuesday, April 8, 2014. less

Mayor of San Antonio, Julian Castro speaks during the 'Pathway to the American Dream: Immigration Policy in the 21st Century' panel at the Civil Rights Summit at the LBJ Presidential Library on the University ... more

Photo: Deborah Cannon, Photo Pool

Mayor of San Antonio, Julian Castro speaks during the 'Pathway... Photo-6195254.83693 - San Antonio Express-News

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Moderator Brian Sweany, Senior Executive Editor at Texas Monthly, left, listens to a comment by Mayor of San Antonio, Julian Castro during the 'Pathway to the American Dream: Immigration Policy in the 21st Century' panel at the Civil Rights Summit at the LBJ Presidential Library on the University of Texas campus in Austin, Tx., on Tuesday, April 8, 2014. less

Moderator Brian Sweany, Senior Executive Editor at Texas Monthly, left, listens to a comment by Mayor of San Antonio, Julian Castro during the 'Pathway to the American Dream: Immigration Policy in the 21st ... more

Former President Jimmy Carter greets Luci Baines Johnson, the daughter of LBJ, as he tours the Cornerstones of Civil Rights exhibit in the library, on the first day of the Civil Rights Summit in Austin, TX. Tuesday evening April 8, 2014. less

Former President Jimmy Carter greets Luci Baines Johnson, the daughter of LBJ, as he tours the Cornerstones of Civil Rights exhibit in the library, on the first day of the Civil Rights Summit in Austin, TX. ... more

The Civil Rights Summit at the LBJ Presidential Library in Austin, TX--Former President Jimmy Carter waves goodbye to the crowd after a he sat down for a conversation with Mark Updegrove, Director of the LBJ Presidential Library, on the first day of the Civil Rights Summit in Austin, TX. Tuesday evening April 8, 2014. less

The Civil Rights Summit at the LBJ Presidential Library in Austin, TX--Former President Jimmy Carter waves goodbye to the crowd after a he sat down for a conversation with Mark Updegrove, Director of the LBJ ... more

Photo: Ralph Barrera, Photo Pool

The Civil Rights Summit at the LBJ Presidential Library in Austin,... Photo-6195229.83693 - San Antonio Express-News

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Former U.S. President Jimmy Carter speaks onstage with Mark Updegrove, director of the Lyndon B. Johnson Presidential Library in Austin, on the first day of the Civil Rights Summit, Tuesday, April 8, 2014, in Austin, Texas. less

Former U.S. President Jimmy Carter speaks onstage with Mark Updegrove, director of the Lyndon B. Johnson Presidential Library in Austin, on the first day of the Civil Rights Summit, Tuesday, April 8, 2014, in ... more

Photo: Ralph Barrera, Associated Press

Former U.S. President Jimmy Carter speaks onstage with Mark... Photo-6195189.83693 - San Antonio Express-News

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Former President Jimmy Carter poses for a family photograph with members of President Lyndon Baines Johnson family as he tours the Cornerstones of Civil Rights exhibit at the LBJ Library Tuesday evening April 8, 2014. less

Former President Jimmy Carter poses for a family photograph with members of President Lyndon Baines Johnson family as he tours the Cornerstones of Civil Rights exhibit at the LBJ Library Tuesday evening April ... more

Photo: Ralph Barrera, Photo Pool

Former President Jimmy Carter poses for a family photograph with... Photo-6195215.83693 - San Antonio Express-News

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Luci Baines Jonson, daughter of former President Lyndon Johnson, gives a reading prior to a speech by former President Bill Clinton on the second day of the Civil Rights Summit at the LBJ Presidential Library April 9, 2014 in Austin, Texas. The summit is marking the 50th anniversary of the passing of the Civil Rights Act legislation, with U.S. President Barack Obama making the keynote speech on April 10. less

Luci Baines Jonson, daughter of former President Lyndon Johnson, gives a reading prior to a speech by former President Bill Clinton on the second day of the Civil Rights Summit at the LBJ Presidential Library ... more

Bernice King, left, youngest daughter of Martin Luther King Jr., gives a reading during the Civil Rights Summit on Wednesday, April 9, 2014, in Austin, Texas. Lynda Johnson Robb, right, daughter of former President Lyndon Baines Johnson, also spoke. less

Bernice King, left, youngest daughter of Martin Luther King Jr., gives a reading during the Civil Rights Summit on Wednesday, April 9, 2014, in Austin, Texas. Lynda Johnson Robb, right, daughter of former ... more

Former President Bill Clinton addresses the audience during the Civil Rights Summit at the LBJ Presidential Library on the University of Texas campus in Austin, Tx., on Wednesday, April 9, 2014.

Former President Bill Clinton addresses the audience during the Civil Rights Summit at the LBJ Presidential Library on the University of Texas campus in Austin, Tx., on Wednesday, April 9, 2014.

Photo: Dborah Cannon, Photo Pool

Former President Bill Clinton addresses the audience during the... Photo-6195214.83693 - San Antonio Express-News

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Former President Bill Clinton speaks during the Civil Rights Summit on Wednesday, April 9, 2014, in Austin, Texas. Clinton used the 50th anniversary of the Civil Rights Act to criticize efforts in several states to restrict voting, saying they threaten to roll back half a century of progress. less

Former President Bill Clinton speaks during the Civil Rights Summit on Wednesday, April 9, 2014, in Austin, Texas. Clinton used the 50th anniversary of the Civil Rights Act to criticize efforts in several ... more

Photo: Jack Plunkett, Associated Press

Former President Bill Clinton speaks during the Civil Rights Summit... Photo-6195188.83693 - San Antonio Express-News

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Luci Baines Johnson, daughter of LBJ, greets the Rev. Jesse Jackson before the special event where former President George W. Bush addresses a private gathering in the LBJ Library Atrium on April 10, 2014 in Austin, Texas. The summit is marking the 50th anniversary of the passing of the Civil Rights Act legislation, with U.S. President Barack Obama making the keynote speech on April 10. less

Luci Baines Johnson, daughter of LBJ, greets the Rev. Jesse Jackson before the special event where former President George W. Bush addresses a private gathering in the LBJ Library Atrium on April 10, 2014 in ... more

Former President George W. Bush addresses a private gathering in the LBJ Library Atrium, the last day of the Civil Rights Summit on April 10, 2014 in Austin, Texas. The summit is marking the 50th anniversary of the passing of the Civil Rights Act legislation, with U.S. President Barack Obama making the keynote speech on April 10. less

Former President George W. Bush addresses a private gathering in the LBJ Library Atrium, the last day of the Civil Rights Summit on April 10, 2014 in Austin, Texas. The summit is marking the 50th anniversary ... more

Photo: Pool, Getty Images

Former President George W. Bush addresses a private gathering in... Photo-6195209.83693 - San Antonio Express-News

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Moderator Shirley Franklin, back to camera, and from left to right, basketball hall of famer David Robinson, Maria Schriver, Lex Frieden, Professor of Biomedical Informatics and Physical Medicine and Rehabilitation, and Translation founder and CEO Steve Stoute, take part in the "Social Justice in the 21st Century" panel during the Civil Rights Summit on Thursday, April 10, 2014, in Austin, Texas. less

Moderator Shirley Franklin, back to camera, and from left to right, basketball hall of famer David Robinson, Maria Schriver, Lex Frieden, Professor of Biomedical Informatics and Physical Medicine and ... more

Photo: Jack Plunkett, Associated Press

Moderator Shirley Franklin, back to camera, and from left to right,... Photo-6195197.83693 - San Antonio Express-News

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Basketball hall of famer David Robinson, left, and Maria Schriver take part in the "Social Justice in the 21st Century" panel during the Civil Rights Summit on Thursday, April 10, 2014, in Austin, Texas.

Basketball hall of famer David Robinson, left, and Maria Schriver take part in the "Social Justice in the 21st Century" panel during the Civil Rights Summit on Thursday, April 10, 2014, in Austin, Texas.

CBS News reporter Bob Schieffer, left, and former Secretary of Education Margaret Spellings take part in the "Education : The Ultimate Civil Right" panel during the Civil Rights Summit on Thursday, April 10, 2014, in Austin, Texas. less

CBS News reporter Bob Schieffer, left, and former Secretary of Education Margaret Spellings take part in the "Education : The Ultimate Civil Right" panel during the Civil Rights Summit on Thursday, April 10, ... more

Basketball hall of famer David Robinson, Maria Schriver, and Translation founder and CEO Steve Stoute, from left, take part in the "Social Justice in the 21st Century" panel during the Civil Rights Summit on Thursday, April 10, 2014, in Austin, Texas. less

Basketball hall of famer David Robinson, Maria Schriver, and Translation founder and CEO Steve Stoute, from left, take part in the "Social Justice in the 21st Century" panel during the Civil Rights Summit on ... more

Lex Frieden, Professor of Biomedical Informatics and Physical Medicine and Rehabilitation, Translation founder and CEO Steve Stoute and Basketball hall of famer David Robinson, from right, answer media questions following the "Social Justice in the 21st Century" panel during the Civil Rights Summit on Thursday, April 10, 2014, in Austin, Texas. less

Lex Frieden, Professor of Biomedical Informatics and Physical Medicine and Rehabilitation, Translation founder and CEO Steve Stoute and Basketball hall of famer David Robinson, from right, answer media ... more

US President Barack Obama tours the great hall of the Lyndon B. Johnson Presidential Library April 10, 2014 in Austin, Texas. Obama is attending a Civil Rights Summit to celebrate the 50th anniversary of the Civil Rights Act of 1964. less

US President Barack Obama tours the great hall of the Lyndon B. Johnson Presidential Library April 10, 2014 in Austin, Texas. Obama is attending a Civil Rights Summit to celebrate the 50th anniversary of the ... more

Photo: BRENDAN SMIALOWSKI, Getty Images

US President Barack Obama tours the great hall of the Lyndon B.... Photo-6195211.83693 - San Antonio Express-News

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Taboola Gallery Frame Item-85307.83693 - San Antonio Express-News

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Mabel Staples performs the song "We Shall Overcome" before President Barack Obama speaks on the third day of the Civil Rights Summit April 10, 2014 in Austin, Texas. The summit marks the 50th anniversary of the passing of the Civil Rights Act legislation. less

Mabel Staples performs the song "We Shall Overcome" before President Barack Obama speaks on the third day of the Civil Rights Summit April 10, 2014 in Austin, Texas. The summit marks the 50th anniversary of the ... more

Social activist Julian Bond, and leader in the American civil rights movement, and Luci Baines Johnson, the younger daughter of President Lyndon Baines Johnson, join hands as they sing "We Shall Overcome" before President Barack Obama spoke at the LBJ Presidential Library, Thursday, April 10, 2014, in Austin, Texas, during the Civil Rights Summit to commemorate the 50th anniversary of the signing of the Civil Rights Act. less

Social activist Julian Bond, and leader in the American civil rights movement, and Luci Baines Johnson, the younger daughter of President Lyndon Baines Johnson, join hands as they sing "We Shall Overcome" ... more

Photo: Carolyn Kaster, Associated Press

Social activist Julian Bond, and leader in the American civil... Photo-6195194.83693 - San Antonio Express-News

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President Barack Obama gives a keynote address during the Civil Rights Summit on Thursday, April 10, 2014, in Austin, Texas.

President Barack Obama gives a keynote address during the Civil Rights Summit on Thursday, April 10, 2014, in Austin, Texas.

Photo: RICARDO B. BRAZZIELL, Associated Press

President Barack Obama gives a keynote address during the Civil... Photo-6195192.83693 - San Antonio Express-News

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US Representative John Lewis hugs President Barack Obama after Obama's speech during the Civil Rights Summit at the LBJ Presidential Library in Austin, TX on Wednesday, April 10, 2014. President Barack Obama, celebrating a half-century of the Civil Rights Act, used the image of Lyndon B. Johnson to urge perseverance and courage to move civil rights forward. The nation’s first black president spoke at the Civil Rights Summit, examining the 50th anniversary of Johnson’s signing the seminal act ending segregation. less

US Representative John Lewis hugs President Barack Obama after Obama's speech during the Civil Rights Summit at the LBJ Presidential Library in Austin, TX on Wednesday, April 10, 2014. President Barack Obama, ... more